Scientists began investigating whether tetrahydrocannabinol (THC), one of the active ingredients in cannabis, could accelerate the onset of disability, after previous studies had suggested cannabis could slow the advance of MS.

"I'm very disappointed - not for me - but for people with MS and I think it's desperately important that we try to find treatments that slow their progression down."

News Pictures Of The Day: 29 May

News Pictures Of The Day: 29 May

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Sir Chris Bonington holds the Olympic torch on the summit of Mount Snowdon on May 29, 2012 in Llanberis, United Kingdom. Legendary mountaineer Sir Chris Bonington, aged 77, was given the honour of carrying the torch to the summit of Wales's highest mountain, the place his climbing career began 61 years ago. The Olympic Flame is now on day 11 of a 70-day relay involving 8,000 torchbearers covering 8,000 miles. (Photo credit: Getty)